Abstract: A roof rail for attaching to a transport means, such as to the roof of a car or boat, the basic element being a tubular profile, where each of its two ends is furnished with a fastening means for firm mounting connection to the roof of the transport means. This fastening means is part of a clamping member firmly positioned at least partly inside the tubular profile and consisting of two lengthwise parts joined at one of their ends by a stretching element, with the possibility of mutual swivelling by means of the opening motion of their arms at the opposite ends, until these two arms are in a position where they are propped firmly, opposite each other, against the inner walls of the tubular profile.